print("===")


# print(fun(10))


def fun(x):
    return x ** 2


print(fun(10))

try:
    s = "aa"
    print(int(s))
except(RuntimeError):
    print("发生异常")
except ValueError as e:
    print("ValueError:", e)
else:
    print("没有发生异常")
finally:
    print("都会执行")
